Xerath Ult Doesn't Give Baron Timer

Xerath ult gives sight, right? A few times I've had the pleasure of attempting to steal baron from the dominating enemy team. If Xerath ult kills baron, the icon disappears from the mini map and the timer is shown when tab is pressed.

However, if Xerath ult does not kill baron (sight of it being kills is still there) the icon still disappears from the minimap, but the timer is not shown when tab is pressed.

Its not a big deal, just a small bug I've noticed.

Baron spawns, enemy kills baron, Xerath ult gives sight on baron death, not treated as true sight.